<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
    <script src="../js/task1.js"></script>
    <title>js任务一</title>
    <style>
        .content,.btn{
            width: 100%;
            text-align: center;
            margin-top: 10px;
        }
        .content div{
            width: 30%;
            padding-bottom: 30%;
            background: orange;
            float:left;
            margin:10px 0 0 3%;
        }
        .btn button{
            display: block;
            width: 100%;
            margin-bottom: 6px;
            color: orange;
            font-size: 14px;
            font-weight: bold;
            background: white;
            border: 1px solid orange;

        }

    </style>
</head>
<body>
<div class="content">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
</div>
<div style="clear: both"></div>
<div class="btn">
    <button>开始闪</button>
    <button>结束闪</button>
    
</div>
</body>
</html>